If a gasoline engine has an efficiency of 21 percent and losses 780 j to the cooling system and exhaust during each cycle, how much work is done by the engine?

As we know that efficiency of engine is given as

also we know that

given that

efficiency = 21%

now we have

now we have

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

the answer is 12 as i may remember

: )